Packing box

Abstract

A packing box includes a corrugated cardboard box 3 that includes first side wall portions 7 and second side wall portions 9 and in which a vertical ridge line is formed between each of the first side wall portions 7 and each of the second side wall portions 9 with the corrugated cardboard box 3 assembled in a box shape and a reinforcing member 5 that is made of paper having a basis weight of 110 g/m2 or more and is attached to the corrugated cardboard box 3 along a ridge line portion 29 that becomes the vertical ridge line with the corrugated cardboard box 3 assembled in a box shape. The reinforcing member may have a basis weight of 270 g/m2 or more.

What is claimed is: 
     
         1 . A packing box comprising:
 a corrugated cardboard box that includes a first side wall portion and a second side wall portion and in which a vertical ridge line is formed between the first side wall portion and the second side wall portion with the corrugated cardboard box assembled in a box shape; and   a reinforcing member that is made of paper having a basis weight of 110 g/m 2  or more and is attached to the corrugated cardboard box along a ridge line portion that becomes the vertical ridge line with the corrugated cardboard box assembled in a box shape.   
     
     
         2 . The packing box according to  claim 1 , wherein
 the reinforcing member has a basis weight of 270 g/m 2  or more.   
     
     
         3 . The packing box according to  claim 1 , wherein
 the corrugated cardboard box includes first flaps continuous with the first side wall portion in a height direction and second flaps continuous with the second side wall portion in the height direction, and   the reinforcing member is attached to a portion from one of the first flaps and one of the second flaps located on one side of the ridge line portion in the height direction to another of the first flaps and another of the second flaps located on another side of the ridge line portion in the height direction and passes through the ridge line portion.   
     
     
         4 . The packing box according to  claim 1 , wherein
 the reinforcing member is made of coated paper.   
     
     
         5 . The packing box according to  claim 1 , wherein
 the first side wall portion includes a first inner core in which a plurality of waves are formed,   the second side wall portion includes a second inner core in which a plurality of waves are formed,   a portion farthest from the ridge line portion of portions of the first side wall portion susceptible to being crushed when a lateral load is applied to the vertical ridge line with the reinforcing member not attached to the corrugated cardboard box is located at a position of an m-th wave from the ridge line portion of the plurality of waves formed in the first inner core,   a portion farthest from the ridge line portion of portions of the second side wall portion susceptible to being crushed when a lateral load is applied to the vertical ridge line with the reinforcing member not attached to the corrugated cardboard box is located at a position of an n-th wave from the ridge line portion of the plurality of waves formed in the second inner core, and   the reinforcing member has a width corresponding to a distance from an (m+1)th wave from the ridge line portion of the plurality of waves formed in the first inner core to an (n+1)th wave from the ridge line portion of the plurality of waves formed in the second inner core.   
     
     
         6 . The packing box according to  claim 1 , wherein
 the corrugated cardboard box is made of C-flute corrugated cardboard.